// Copyright © 2017 The virtual-kubelet authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package root

import (
	"github.com/virtual-kubelet/virtual-kubelet/errdefs"
	corev1 "k8s.io/api/core/v1"
)

// getTaint creates a taint using the provided key/value.
// Taint effect is read from the environment
// The taint key/value may be overwritten by the environment.
func getTaint(c Opts) (*corev1.Taint, error) {
	value := c.Provider

	key := c.TaintKey
	if key == "" {
		key = DefaultTaintKey
	}

	if c.TaintEffect == "" {
		c.TaintEffect = DefaultTaintEffect
	}

	key = getEnv("VKUBELET_TAINT_KEY", key)
	value = getEnv("VKUBELET_TAINT_VALUE", value)
	effectEnv := getEnv("VKUBELET_TAINT_EFFECT", c.TaintEffect)

	var effect corev1.TaintEffect
	switch effectEnv {
	case "NoSchedule":
		effect = corev1.TaintEffectNoSchedule
	case "NoExecute":
		effect = corev1.TaintEffectNoExecute
	case "PreferNoSchedule":
		effect = corev1.TaintEffectPreferNoSchedule
	default:
		return nil, errdefs.InvalidInputf("taint effect %q is not supported", effectEnv)
	}

	return &corev1.Taint{
		Key:    key,
		Value:  value,
		Effect: effect,
	}, nil
}
